vec::find should return a reference

[erickt]

Either that or we add a vec::find_ref function. Right now it returns a copy, so it trips up the no-implicit-copies warning.

[catamorphism]

Not critical for 0.6, de-milestoning

[thestinger]

I don't think vectors should expose this method at all, it should just be an iter module function for any iterator. The vector can't do anything special to make it faster.

[thestinger]

Closing, since iterators make methods like this obsolete.